8
BI-DIRECTIONAL TOOL TURRET - March - 2011
AUTOMATIC TOOL CHANGER
3. INSTALLATION
3.1 Fitment on the machine
Turret has the two alternative positions for the coolant entry. Coolant outlet is at two valves position, '1 and 2 '
located on the coolant ring as in the figure. Spring loaded poppet valve (fig 3.1.2) is fitted on the working position;
and other entry position is blocked by the plug (28)
3.1a Procedure for adjustment :
Turret main
body
M8x50L
63+0.1
Falt seating
surface
Turret base
Machine
Fig 3.0
Turret shouldbealignedbydialingsurfaceoftheindexingflange.
Clamping bolts should be tightened after aligning the seating
surface,squaretothelatheaxis.
Clamping bolts should use machine washers of extra thick-ness
(min.5mm)toensureproperclamping.
Dowel Pins are not recommended for ensuring the alignment
of turret. It is preferable to allow the turret to slip in the event
of an accidental shock or overload. This slipping absorbs some
of the energy of the shock and reduces the possible damage.
Turret can again be brought back to alignment by dialing a
referencesurfaceonthetooldisc.
There is one more reason for avoiding the dowel pin. Accidental collisions are not uncommon in the field of
CNC lathes. In the event of a collision, dowel pins can get sheared or damaged. It is a difficult task to remove
such dowel pins, and to fit new ones. New dowels may involve enlarging the damaged hole by drilling and
reaming. This is difficult to do at the customer's place. This is a difficult operation to be done on site, and is
most likely to be less than perfect. On the other hand, it is perfectly possible to use the turret and tool disc
without the use of dowels. The friction joint can easily take up normal cutting loads, including occasional over
loads.
Pragati turrets, therefore, do not have a provision of dowelling the body to the base.
Both the coolant ring and coolant flange have provision for angular adjustment. Coolant flange should be adjusted
to align the 'O' Ring (20) with coolant passages on tool disc. Coolant ring angle should then be adjusted by the
same angle to align the coolant valve with a hole in coolant flange. This can be done by aligning the marker lines
onthese components.
3.2 Coolant system
FIG 3.1
VIEW WITH FRONT COOLANT FLANGE REMOVED.
COOLANT ENTRY POSITION
AVAILABLE ON OPPOSITE SIDES.
COOLANT EXIT
COOLANT FLANGE
(14)
COOLANT RING (17)
1
2
Insert suitable rod and use
it as a handle for the
adjustment of angular
position of Coolant ring
CLAMPS (15)
Angle α
depends on
the tool disc
design
α
O - RING (20)
FIG 3.1a
CUT SECTION AT 1
20
28
26
FIG 3.1b
CUT SECTION AT 2
5
18
19
14
17
21
130 129 24 1
